Werk #12728: cisco_asa_failover: Improve monitoring of Cisco ASA Failover

This werk improves the monitoring of Cisco ASA Failover setups (check plugin cisco_asa_failover).

• The corresponding service is now also discovered on Cisco Firepower devices.
• The service is renamed from "Cluster Status" to "Failover Status". Already existing services will continue to work, however, new services will be detected under the new name. This renaming is necessary because ASA clusters are something completely different than ASA failover pairs. In ASA clusters, up to 16 identical devices are connected by a control link and they all handle traffic at the same time. Cisco ASA failover pairs on the other hand consist of two identical devices connected by a failover link. Only one of the these devices, the active one, handles traffic. The other one is in standby and only takes over in case the active unit fails.
• The check plugin now has two additional configuration options (ruleset "Failover states"): the monitoring status in case either the local or the remote device are not active or in standby and the monitoring status in case the failover link is not up. Previously, these monitoring statuses we hard-coded to WARN and CRIT, which is still the default.

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